TWI440948B - Camera module - Google Patents

Description

Camera module

The present invention relates to the field of packaging technologies, and in particular, to a camera module capable of protecting an actuator.

With the development of optical imaging technology, lens modules are widely used in various imaging devices such as digital cameras and video cameras (see Capturing images with digital still cameras, Micro, IEEE Volume: 18, issue: 6, Nov.-Dec. 1998 Page(s): 14-19). Portable electronic devices such as mobile phones incorporating lens modules have been favored by many consumers.

The focus and zoom functions of the camera module are usually implemented using actuators. Referring to FIG. 4, the camera module 400 includes a circuit board 410, an actuator 420, a lens module 430, and an actuator power control element 440. Actuator 420 and actuator power control element 440 are each packaged on circuit board 410. The actuator 420 is typically a voice coil motor that is common in the art and typically includes a stationary barrel 421, a movable barrel 422, and a spring 423. The elastic piece 423 connects the movable charging cylinder 422 to the fixed charging cylinder 421. The elastic piece 423 is usually a metal foil. In the actuator 420, a magnetic element 424 is usually disposed in the fixed barrel 421, and a coil 425 is disposed on the surface of the movable barrel 422. The lens module 430 is housed in a movable cartridge 422, and an actuator power control element 440 is coupled to the coil 425 for controlling the current in the coil 425. Due to the electromagnetic inductive phenomenon, when a current is applied to the coil 425, the coil 425 is subjected to the action of the magnetic force of the magnetic element 424 to generate motion, which is opposite to the movable barrel 422. When the fixed loading cylinder 421 moves, the elastic piece 423 is deformed, and the restoring force of the elastic piece 423 and the coil 425 are subjected to a magnetic field to cause the movable loading cylinder 422 to be at a certain position.

However, in actual use, the impact on the camera module 400 due to human error or falling, the deformation of the elastic piece 423 of the actuator 420 of the camera module 400 exceeds its elastic deformation range. The permanent deformation causes the camera module 400 to cause errors in focusing or zooming, and even the malfunction cannot be activated, which seriously affects the imaging quality of the camera module 400.

In view of this, it is necessary to provide a camera module to prevent the camera module from being permanently deformed by the external force of the actuator.

A camera module will be described below by way of example.

The invention relates to a camera module comprising a lens module, an actuator, an actuator power control element and a motion sensor. The actuator includes a fixed barrel, a movable barrel for receiving the lens module, and a spring piece connected between the movable barrel and the fixed barrel. The fixed barrel is provided with a magnetic element, and the movable barrel is provided with a coil corresponding to the magnetic element. The coil is in electrical communication with the actuator power control element for controlling current in the coil to adjust the force between the coil and the magnetic element. The motion sensor is configured to sense motion of a camera module, and the actuator power control component is electrically connected to the motion sensor for controlling a current in the coil according to a result of the motion sensor sensing, Thereby, the relative position of the movable loading cylinder and the fixed loading cylinder when the camera module is moved is controlled, so that the elastic piece moves in the elastic range thereof.

In the technical solution, since the motion sensor is used to sense the motion of the camera module, And transmitting the sensed signal to the actuator power control component, such that the actuator power control component controls the magnitude or direction of the current to the actuator, and controls the spring of the actuator to move within its elastic range, Effectively avoid permanent deformation of the shrapnel, avoiding the problem of focusing, zooming, or malfunctioning of the camera module due to permanent deformation of the shrapnel, and improving the image quality of the camera module.

100, 200, 300, 400‧‧‧ camera modules

110, 230, 350, 410‧‧‧ circuit boards

111‧‧‧ first surface

120, 250, 420‧‧ ‧ actuators

121, 251, 422‧‧‧ activities cartridge

122, 252, 421‧‧‧ fixed cartridge

123, 253, 423‧‧ ‧ shrapnel

124, 254, 361, 425‧‧ ‧ coil

125, 255, 424‧‧‧ magnetic components

130, 430‧‧‧ lens module

140, 210, 310‧‧‧ image sensor

150, 240, 370, 440‧‧‧ actuator power control components

160, 220, 320‧‧‧ motion sensors

330‧‧‧Substrate

340‧‧‧ wafer

FIG. 1 is a schematic diagram of a camera module provided by a first embodiment of the present technical solution.

2 is a schematic diagram of a camera module provided by a second embodiment of the present technical solution.

FIG. 3 is a schematic diagram of a camera module according to a third embodiment of the present technical solution.

4 is a schematic diagram of a camera module of the prior art.

The camera module provided by the technical solution is further described below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 , a camera module 100 according to a first embodiment of the present technology includes a circuit board 110 , an actuator 120 , a lens module 130 , an image sensor 140 , an actuator power control component 150 , and a motion Sensor 160.

The circuit board 110 has a plate shape with a first surface 111. In this embodiment, the circuit board 110 is a main board of a personal electronic device such as a mobile phone or a digital camera, and has various electronic components for realizing the functions of the electronic device and a circuit for realizing the functions of the above electronic components. The circuit board 110 is used to carry the actuator 120, the lens module 130, the image sensor 140, the actuator power control element 150, and the motion sensor 160.

The actuator 120 includes a movable barrel 121, a fixed barrel 122, and a resilient piece 123. The movable cylinder 121 is used to house the lens module 130. The movable loading cylinder 121 is opposite to the image sensor 140 Correspondingly, the lens module 130 received in the movable cylinder 121 corresponds to the image sensor 140. The lens module 130 can include optical elements such as a plurality of lenses and spacers for forming an image, so that the image sensor 140 can convert the image of the lens module 130 into an electrical signal and transmit it to the outside through the circuit board 110. The movable cylinder 121 is housed in the fixed cylinder 122. The movable barrel 121 is coupled to the fixed barrel 122 by a resilient piece 123. In this embodiment, the movable charging cylinder 121 is disposed coaxially with the fixed loading cylinder 122, so that the central axis does not shift when the movable loading cylinder 121 moves relative to the fixed loading cylinder 122. In this embodiment, the actuator 120 has two Shrapnel 123. The two elastic pieces 123 are respectively disposed at two ends of the movable loading cylinder 121 and are perpendicular to the central axis of the movable loading cylinder 122. The movable cylinder 121 is provided with a coil 124, and the winding direction of the coil 124 is perpendicular to the central axis of the movable cylinder 121. A magnetic element 125 is disposed in the fixing barrel 122 at a position corresponding to the coil 124. The magnetic element 125 may be made of a permanent magnet material such as neodymium iron boron alloy, samarium cobalt alloy, or alnico alloy. The coil 124 is in the magnetic field of the magnetic element 125, and the magnetic field direction of the magnetic element 125 is perpendicular to the central axis direction of 124, that is, perpendicular to the central axis of the movable barrel 122. According to Fleming's left-hand rule, the magnitude and direction of the current of the control coil 124 can drive the movable cylinder 122 and the lens module 130 mounted in the movable cylinder 122 to move along the central axis of the fixed cylinder 121, that is, the controllable activity The relative position of the cartridge 122 and the fixed cartridge 121.

The actuator power control component 150 is operative to control the magnitude of the current in the actuator of the camera module 120, which is electrically coupled to the coil 124 in the actuator 120 for adjusting the magnitude of the current in the 124 to control the coil 124 and the magnetic component. The interaction force of 125 adjusts the relative position of the fixed barrel 121 and the movable barrel 122. In this embodiment, the actuator power control component 150 is also packaged on the first surface 111 of the circuit board 110 and electrically connected to the motion sensor 130 and the coil 124 of the actuator 120 by circuitry in the circuit board 110. .

The motion sensor 130 is used for the motion of the camera module 100, such as the acceleration of the motion of the camera module 100, and the acceleration of the motion is processed to obtain a digital signal, a telecommunication signal or other signals. The motion sensor 160 is electrically coupled to the actuator power control component 150 such that 140 can control the current in the coil 124 based on the sensing result of the motion sensor 130, thereby controlling the movable cartridge 122 and the fixed when the camera module 100 is in motion. The relative position of the cartridge 121 is such that the elastic piece 123 moves within its elastic range. In this embodiment, the motion sensor 130 is encapsulated on the first surface 111 of the circuit board 110.

In this embodiment, the actuator 120, the motion sensor 160, and the actuator power control element 150 can be assembled to the circuit board 110 by techniques such as surface mounting. Motion sensor 160 is electrically coupled to actuator power control component 150, which is electrically coupled to coil 124 of actuator 120.

Referring to FIG. 1, when the camera module 100 is subjected to external impact or improper operation, the movable cylinder 122 may be subjected to an impact force to cause a deformation. For example, the movable cylinder 122 may be subjected to an impact force on the object side of the camera module 100 such that the elastic piece 123 is deformed toward the object side of the camera module 100, that is, an acceleration toward the object side of the camera module 100 is generated. At this time, the motion sensor 160 can sense the acceleration and convert it into a digital signal or an electrical signal and transmit the signal to the actuator power control component 150. The actuator power control element 150 controls the current in the coil 124 of the actuator 120 to control the relative position of the movable barrel 122 to the fixed barrel 121 such that the deformation of 123 is always within its elastic deformation range. That is, the coil 124 in the actuator 120 causes the electromagnetic force to the phase side of the camera module 100 in the magnetic field of the magnetic element 125 due to the electromagnetic induction phenomenon, so that the movable cylinder 122 is moved toward the camera module relative to the fixed cylinder 121. The phase side movement of the group 100 drives the elastic piece 123 connected between the fixed barrel 121 and the movable barrel 122 to move toward the side of the camera module 100. The acceleration of the movement of the elastic piece 123 toward the camera module 100 and the acceleration of the object side of the camera module 100 due to the impact of the external force cancel each other, so that the deformation of the elastic piece 123 due to the impact of the external force can be reduced, so that the deformation of the elastic piece 123 is always Within the range of its elastic deformation, without permanent deformation.

Referring to FIG. 2 , the camera module 200 of the second embodiment of the present invention has a structure similar to that of the camera module 100 of the first embodiment of the present invention, and the difference is that the motion sensor 220 is encapsulated in the image. Sensor 210. Since the image sensor 210 is packaged on the circuit board 230, circuitry is disposed within the circuit board 230 that can cause the motion sensor 220 to be in electrical communication with the actuator power control element 240 and can cause the actuation The device 250 is in electrical communication with the actuator power control element 240.

In this embodiment, the motion sensor 220 is packaged on the image sensor 210 by means of a system package (SIP), so that the image sensor 210 and the motion sensor 220 are integrated to increase the density of the package. , can save the space occupied by the camera module 200. Of course, the image sensor 210 can also package a chip that implements other functions.

Actuator power control element 240 is electrically coupled to motion sensor 220, and coil 254 in actuator 250 is in electrical communication with actuator power control element 240. Thus, when the motion sensor 220 senses that the motion of the camera module 200 is transmitted to the actuator power control component 240, the actuator power control component 240 controls the current of the coil 254 of the actuator 250. The movable cylinder 251 and the fixed cylinder 252 in the actuator 250 generate a force opposite to the direction of the external impact force to prevent the deformation of the elastic piece 253 from exceeding the elastic range due to the external impact, that is, the elastic piece 253 can be ensured. Will produce permanent deformation. That is, when the camera module 200 is subjected to an external impact or an improper operation, the movable cylinder 251 may be subjected to an impact force to cause a deformation. E.g, The movable cylinder 251 may be subjected to an impact force toward the object side of the camera module 200 such that the elastic piece 253 is deformed toward the object side of the camera module 200, that is, an acceleration toward the object side of the camera module 200 is generated. At this time, the motion sensor 220 can sense the acceleration and convert it into a digital signal or a signal and transmit the signal to the actuator power control element 240. The actuator power control element 240 controls the current in the coil 254 to control the relative position of the movable barrel 251 and the fixed barrel 252 such that the deformation of the tab 253 is always within its elastic deformation range. That is, the coil 254 is caused to generate an electromagnetic force to the phase side of the camera module 200 in the magnetic field of the magnetic element 255 due to the electromagnetic induction phenomenon, thereby causing the movable barrel 251 to move toward the side of the camera module 200 with respect to the fixed barrel 252. And driving the elastic piece 253 connected between the fixed barrel 252 and the movable barrel 251 to move to the side of the camera module 200. The acceleration of the movement of the elastic piece 253 to the side of the camera module 200 and the acceleration of the object side of the camera module 200 due to the impact of the external force cancel each other, so that the deformation of the elastic piece 253 due to the impact of the external force can be reduced, so that the deformation of the elastic piece 253 is always Within the range of its elastic deformation, without permanent deformation.

Referring to FIG. 3, a camera module 300 according to a third embodiment of the present invention has a structure similar to that of the camera module 200 of the second embodiment, except that: 300 includes a wafer 340, and the wafer 340 includes a substrate. 330 and an image sensor 310 and a motion sensor 320 integrated in the substrate 330. The image sensor 310 and the motion sensor 320 are formed on the substrate 330 by a micro-electromechanical process, and then integrated into the substrate 330 by a shellcase package. Wafer 340 is packaged in circuit board 350, and circuitry is disposed within circuit board 350 that causes motion sensor 320 to be in electrical communication with actuator power control element 370 and to cause actuator power control element 370 and actuator The coil 361 is in electrical communication.

In this embodiment, since the image sensor 310 and the motion sensor 320 are formed on the same wafer 340 and have the size of the wafer level, the image sensor 310 and the motion sensor 320 can be reduced in the electronic device. The space of 踞. Therefore, the camera module 300 in this embodiment has an electronic device that can be applied to a small size.

In the technical solution, the motion sensor is used to sense the motion of the camera module, and the sensed signal is transmitted to the actuator power control component, so that the actuator power control component controls the actuator to the actuator. The magnitude or direction of the current in the coil. Therefore, the elastic piece of the control actuator is moved within the elastic range thereof, thereby effectively preventing the permanent deformation of the elastic piece, and the problem that the optical axis of the camera module is offset and the focus is not accurate or malfunction due to permanent deformation of the elastic piece can be avoided, and the camera can be improved. Module imaging quality.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ camera module

110‧‧‧Circuit board

111‧‧‧ first surface

120‧‧‧Actuator

121‧‧‧ activities cartridge

122‧‧‧Fixed cartridge

123‧‧‧Shrap

124‧‧‧ coil

125‧‧‧Magnetic components

130‧‧‧Lens module

140‧‧‧Image Sensor

150‧‧‧ power control components

160‧‧‧motion sensor

Claims (6)

A camera module includes a lens module, an actuator, an actuator power control component, an image sensor, and a circuit board, the actuator including a fixed cartridge and a movable cartridge for housing the lens module And a spring piece connected between the movable barrel and the fixed barrel, the fixed barrel is provided with a magnetic element, the movable barrel is provided with a coil corresponding to the magnetic element, the coil and the actuation The power control element is electrically connected, and the actuator power control element is configured to control a current in the coil to adjust a force between the coil and the magnetic element, the improvement being that the camera module further comprises a motion sensor, The motion sensor is configured to sense motion of a camera module, and the actuator power control component is electrically connected to the motion sensor for controlling current in the coil according to a sensing result of the motion sensor, Thereby controlling the relative position of the movable cartridge and the fixed cartridge when the camera module is moved, so that the elastic piece moves within the elastic range thereof, the image sensor is optically coupled with the lens module, and the motion sensor set In the image sensor, the image sensor package to a circuit board, the power supply control element actuator is connected to the circuit board by the motion sensor and an electrical coil. A camera module includes a lens module, an actuator, an actuator power control component, a chip and a circuit board, the actuator comprising a fixed cartridge, a movable cartridge for housing the lens module, and a connection a spring piece between the movable barrel and the fixed barrel, the fixed barrel is provided with a magnetic element, the movable barrel is provided with a coil corresponding to the magnetic element, and the coil and the actuator power supply control The components are in electrical communication, the actuator power control element is for controlling current in the coil to adjust the force between the coil and the magnetic element, the improvement being that the camera module further comprises a motion sensor, the motion The sensor is configured to sense the motion of the camera module, and the actuator power control element is electrically connected to the motion sensor for controlling the current in the coil according to the sensing result of the motion sensor, thereby controlling the camera Active cylinder and solid when the module is in motion The relative positions of the mounting barrels are such that the springs move within their elastic range, the wafers are integrated with an image sensor and the motion sensor, the wafers are packaged on a circuit board, and the actuator power control elements The circuit board is electrically connected to the motion sensor and the coil. The camera module of claim 2, wherein the wafer further comprises a substrate, and the image sensor and the motion sensor are integrated on the substrate. The camera module of claim 1 or 2, wherein the camera module comprises two elastic pieces, one of which is connected to one end of the movable loading cylinder and the fixed loading cylinder, and the other elastic piece is connected. The movable cylinder and the fixed cylinder are close to one end of the phase side. The camera module of claim 1 or 2, wherein the magnetic element is made of a permanent magnet material. The camera module of claim 1 or 2, wherein the magnetic line direction of the magnetic element is perpendicular to a central axis of the coil.